code: def _tuple_to_word(index_tuple):
      """Convert an integer tuple to the corresponding Pauli word.
  
      The Pauli operators are converted as ``0 -> I``, ``1 -> X``,
      ``2 -> Y``, ``3 -> Z``.
  
      Args:
          index_tuple (Tuple[int]): An integer tuple describing the Pauli word
  
      Returns:
          str: The corresponding Pauli word
      """
      return "".join([_PAULIS[i] for i in index_tuple])
  
file_path: pennylane/pennylane/templates/subroutines/arbitrary_unitary.py
imports: import pennylane
  from pennylane.operation import Operation, AnyWires
  from pennylane.ops import PauliRot
label_desc: Use image node_id 1 for calling a global function with example usage: _tuple_to_word(index_tuple) and returns: str